I can't create partition image. Please help me to solve the problem.
Are you trying to create a partition on the device you are using?
If you wish to partition the drive you are using, you must boot from a bootable media like the Live Zorin installer. You can only unmount (umount command) a device that is not in use.
Ah, I did not think about of that possibility.
As I get accustomed to Linux, I tend to overlook 101 questions I have to be careful.